The Yoshitake GP-1000EN is a high-performance pressure reducing valve designed for steam applications. It features a ductile cast iron body and stainless steel trim, equipped with an EN PN16 RF flanged connection. The spherical main valve offers excellent sealability, greatly reducing valve seat leakage to comply with ANSI Class IV standards.

Features

• Significantly improved workability and durability compared with conventional pressure reducing valves.
• Spherical main valve offers great sealability and great reduction of valve seat leakage (compliant with ANSI Class IV).
• Compliant with SHASE-S106 Pressure Reducing Valves (by the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan).
• Simple and robust internal structure.

Specifications

Specification	Value
Application	Steam
Inlet pressure	0.1 - 1.0 MPa
Reduced pressure	0.05 - 0.9 MPa (90% or less of inlet pressure)
Minimum differential pressure	0.05 MPa
Maximum pressure reduction ratio	20:1
Maximum temperature	220°C
Valve seat leakage	0.01% or less of rated flow
Body Material	Ductile cast iron
Valve, valve seat Material	Stainless steel
Piston, Cylinder Material	Brass or bronze
Connection	EN PN16 RF flanged

INFO

Available with trim parts (piston and cylinder) made of stainless steel (GP-1000ENS).

Dimensions and Weights

Size	L (mm)	H1 (mm)	H (mm)	Flange D (mm)	Flange C (mm)	Flange t (mm)	n-h	Weight (kg)
15A	150	64	291	95	65	16	4-14	8.0
20A	150	64	291	105	75	16	4-14	8.5
25A	160	67	300	125	85	18	4-14	10.0
32A	180	82	333	140	100	20	4-19	14.0
40A	200	82	333	150	110	20	4-19	15.5
50A	230	93	353	165	125	20	4-19	21.0
65A	290	100	357	185	145	21	4-19	30.0
80A	310	122	404	210	160	28	8-19	37.0
100A	350	144	450	254	180	32	8-19	57.0

Selection Charts

Nominal Sizes Selection Chart (For Steam)

[Example 1] When selecting the nominal size of a pressure reducing valve whose inlet pressure (P1), reduced pressure (P2), and steam flow rate are 0.6 MPa, 0.4 MPa, and 800 kg/h, respectively, first find intersection point (A) of the inlet pressure of 0.6 MPa and the reduced pressure of 0.4 MPa. Trace down vertically from this intersection point to find intersection point (B) with the flow rate of 800 kg/h. Since intersection point (B) lies between nominal sizes 40A and 50A, select the larger one, 50A.

[Example 2] When selecting the nominal size of a pressure reducing valve whose inlet pressure (P1), reduced pressure (P2), and steam flow rate are 0.8 MPa, 0.05 MPa, and 600 kg/h, respectively, first find intersection point (C) of the inlet pressure of 0.8 MPa and the diagonal line. Trace down to the left from this intersection point to find intersection point (D) with the reduced pressure of 0.05 MPa. Trace down vertically from intersection point (D) to find intersection point (E) with the flow rate of 600 kg/h. Since intersection point (E) lies between nominal sizes 32A and 40A, select the larger one, 40A.

TIP

Set the safety factor at 80 to 90%.

Specifications Selection Chart

Find the intersection point of the inlet and reduced pressures. If the intersection point is within any of the ranges shown in the chart above, the pressures are controllable. (Range A and C cover GP-1000 Series).

Corrected Cv Value

Example: Take a pressure reducing valve whose inlet pressure is 0.8 MPa, the reduced pressure is 0.05 MPa. Find the inlet and reduced pressure intersection point (A) at the above chart, then draw a horizontal line in the leftward direction to point (B) which indicates a correction coefficient of 0.85. For a nominal size of 25A, the corrected Cv value would be calculated as follows (based on formula in source).

Pressure Characteristic Chart

This chart shows variation in reduced pressure when the inlet pressure of 1.0 MPa is changed between 0.3 MPa and 1.0 MPa while the reduced pressure is set at 0.1 MPa.

Safety Valve Setting

Set pressure of safety valve for alarm use at the outlet side of the pressure reducing valve for steam:

Set pressure of pressure reducing valve (MPa)	Set pressure of safety valve (MPa)
0.1 or less	Set pressure of the pressure reducing valve + 0.05 or more
0.11 - 0.4	Set pressure of the pressure reducing valve + 0.08 or more
0.41 - 0.6	Set pressure of the pressure reducing valve + 0.1 or more
0.61 - 0.8	Set pressure of the pressure reducing valve + 0.12 or more
More than 0.8	Set pressure of the pressure reducing valve + 15%

INFO

When a safety valve is installed for alarm use at the outlet side of a pressure reducing valve for steam and there are no laws or regulations specified to comply with, select a safety valve whose blowout capacity is around 10% of the maximum flow rate of the pressure reducing valve.

Flow Rate Table (Partial)

(kg/h)

P1 (MPa)	P2 (MPa)	15A	20A	25A	32A	40A	50A	65A	80A	100A
1	0.05	92	212	369	600	831	1,478	2,310	3,326	5,913
	0.1-0.4	132	303	528	858	1,188	2,112	3,300	4,752	8,448
	0.5	127	292	508	826	1,145	2,035	3,180	4,580	8,142
	0.6	117	269	468	761	1,053	1,873	2,927	4,215	7,494

::: note When the inlet pressure is more than 0.7 MPa and the pressure reduction ratio is more than 10:1, calculate the corrected Cv value by multiplying the rated Cv value by the correction factor C obtained from the chart. :::